conditionally sum / total in a matrix report in rtf template

hi all,

I need to put a condition on my total in a matrix report.

In my following rtf template, need to not include amount in totals when there is <iou>.

for example: in following 2nd and 3rd row has <IOU> so these values should not include in totals, the totals for column 2 and 3 must be zero.